These log messages from chrome://gpu are probably relevant:

[14846:14846:0214/054358.968962:ERROR:sandbox_linux.cc(377)] :
InitializeSandbox() called with multiple threads in process
gpu-process.
        *
[14846:14846:0214/054359.464803:WARNING:angle_platform_impl.cc(49)] :
ProgramGL.cpp:989 (checkLinkStatus): Program link or binary loading
failed with no info log.
        *
[14846:14846:0214/054359.465038:ERROR:shared_context_state.cc(75)] :
Skia shader compilation error ------------------------ Errors: link
failed but did not provide an info log
        *
[14846:14846:0214/054359.857560:WARNING:angle_platform_impl.cc(49)] :
ProgramGL.cpp:989 (checkLinkStatus): Program link or binary loading
failed with no info log.
        *
[14846:14846:0214/054359.857693:ERROR:shared_context_state.cc(75)] :
Skia shader compilation error ------------------------ Errors: link
failed but did not provide an info log
        *
[14846:14846:0214/054400.303862:WARNING:angle_platform_impl.cc(49)] :
ProgramGL.cpp:989 (checkLinkStatus): Program link or binary loading
failed with no info log.
        *
[14846:14846:0214/054400.303984:ERROR:shared_context_state.cc(75)] :
Skia shader compilation error ------------------------ Errors: link
failed but did not provide an info log
        *
[14846:14846:0214/054400.596640:WARNING:angle_platform_impl.cc(49)] :
ProgramGL.cpp:989 (checkLinkStatus): Program link or binary loading
failed with no info log.
        *
[14846:14846:0214/054400.596801:ERROR:shared_context_state.cc(75)] :
Skia shader compilation error ------------------------ Errors: link
failed but did not provide an info log
        *
[14846:14846:0214/054401.785676:WARNING:angle_platform_impl.cc(49)] :
ProgramGL.cpp:989 (checkLinkStatus): Program link or binary loading
failed with no info log.
        *
[14846:14846:0214/054401.785876:ERROR:shared_context_state.cc(75)] :
Skia shader compilation error ------------------------ Errors: link
failed but did not provide an info log
        *
[14846:14846:0214/054401.849102:WARNING:angle_platform_impl.cc(49)] :
ProgramGL.cpp:989 (checkLinkStatus): Program link or binary loading
failed with no info log.
        *
[14846:14846:0214/054401.849361:ERROR:shared_context_state.cc(75)] :
Skia shader compilation error ------------------------ Errors: link
failed but did not provide an info log
        *
[14846:14846:0214/054401.943844:WARNING:angle_platform_impl.cc(49)] :
ProgramGL.cpp:989 (checkLinkStatus): Program link or binary loading
failed with no info log.
        *
[14846:14846:0214/054401.944382:ERROR:shared_context_state.cc(75)] :
Skia shader compilation error ------------------------ Errors: link
failed but did not provide an info log
        *
[14846:14884:0214/054412.777490:ERROR:node_controller.cc(585)] : Trying
to re-add dropped peer 70D0864B25B51522.5F03A3A27A983166
        *
[14846:14884:0214/054425.252779:ERROR:node_controller.cc(585)] : Trying
to re-add dropped peer F09CA60EB907F115.56B37661990A293B
        *
[14846:14846:0214/054432.328708:ERROR:gl_surface_presentation_helper.cc(260)]
: GetVSyncParametersIfAvailable() failed for 1 times!
        *
[14846:14846:0214/054432.346973:ERROR:gl_surface_presentation_helper.cc(260)]
: GetVSyncParametersIfAvailable() failed for 2 times!
        *
[14846:14846:0214/054434.134455:ERROR:gl_surface_presentation_helper.cc(260)]
: GetVSyncParametersIfAvailable() failed for 3 times!
        *
[14846:14884:0214/054435.236670:ERROR:node_controller.cc(585)] : Trying
to re-add dropped peer 9C0BA2574A447F7A.413C17F2E17067BB
        *
[14846:14884:0214/054442.726324:ERROR:node_controller.cc(585)] : Trying
to re-add dropped peer F3F448E7C9D29364.2FEAAC234AF50AC6
        *
[14846:14846:0214/054443.266453:WARNING:angle_platform_impl.cc(49)] :
ProgramGL.cpp:989 (checkLinkStatus): Program link or binary loading
failed with no info log.
        *
[14846:14846:0214/054443.266655:ERROR:shared_context_state.cc(75)] :
Skia shader compilation error ------------------------ Errors: link
failed but did not provide an info log
        *
[14846:14884:0214/054456.701169:ERROR:node_controller.cc(585)] : Trying
to re-add dropped peer 8D4BEC829F6527A6.F6F701678873F7BA
        *
[14846:14884:0214/054456.703546:ERROR:node_controller.cc(585)] : Trying
to re-add dropped peer CCA0665A1580331.BC1728A93D91B3F4
        *
[14846:14884:0214/054457.160946:ERROR:node_controller.cc(585)] : Trying
to re-add dropped peer BE5DEFB0120BC992.AA30F90B9D664F4
        *
[14846:14846:0214/054635.454820:WARNING:angle_platform_impl.cc(49)] :
ProgramGL.cpp:989 (checkLinkStatus): Program link or binary loading
failed with no info log.
        *
[14846:14846:0214/054635.455167:ERROR:shared_context_state.cc(75)] :
Skia shader compilation error ------------------------ Errors: link
failed but did not provide an info log
        *
[14846:14846:0214/054728.173274:WARNING:angle_platform_impl.cc(49)] :
ProgramGL.cpp:989 (checkLinkStatus): Program link or binary loading
failed with no info log.
        *
[14846:14846:0214/054728.173414:ERROR:shared_context_state.cc(75)] :
Skia shader compilation error ------------------------ Errors: link
failed but did not provide an info log
        *
[14846:14846:0214/054730.016535:WARNING:angle_platform_impl.cc(49)] :
ProgramGL.cpp:989 (checkLinkStatus): Program link or binary loading
failed with no info log.
        *
[14846:14846:0214/054730.016678:ERROR:shared_context_state.cc(75)] :
Skia shader compilation error ------------------------ Errors: link
failed but did not provide an info log
        *
[14846:14846:0214/054746.348160:WARNING:angle_platform_impl.cc(49)] :
ProgramGL.cpp:989 (checkLinkStatus): Program link or binary loading
failed with no info log.
        *
[14846:14846:0214/054746.348312:ERROR:shared_context_state.cc(75)] :
Skia shader compilation error ------------------------ Errors: link
failed but did not provide an info log
        *
[14846:14846:0214/054747.834246:WARNING:angle_platform_impl.cc(49)] :
ProgramGL.cpp:989 (checkLinkStatus): Program link or binary loading
failed with no info log.
        *
[14846:14846:0214/054747.834436:ERROR:shared_context_state.cc(75)] :
Skia shader compilation error ------------------------ Errors: link
failed but did not provide an info log
        *
[14846:14884:0214/054749.802058:ERROR:node_controller.cc(585)] : Trying
to re-add dropped peer 8262F7845E1393B3.5122886470EC2A1E

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to chromium-browser in Ubuntu.
https://bugs.launchpad.net/bugs/1948052

Title:
  [snap] some pulldown menus corrupted in 21.10

Status in chromium-browser package in Ubuntu:
  Confirmed

Bug description:
  Several (but not all) of my Chromium Web Browser pulldown bookmarks
  menus are highly corrupted with flashing colors since using 21.10

  Your first line refuses to accept Chromium, saying that it does not exist in 
Ubuntu.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu71
  Architecture: amd64
  CasperMD5CheckResult: unknown
  DistroRelease: Ubuntu 21.10
  InstallationDate: Installed on 2021-01-30 (377 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  Package: chromium-browser 1:85.0.4183.83-0ubuntu2
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 5.13.0-28.31-generic 5.13.19
  Snap.Changes: no changes found
  Snap.ChromeDriverVersion:
   mkdir: cannot create directory '/run/user/0': Permission denied
   ChromeDriver 98.0.4758.80 
(7f0488e8ba0d8e019187c6325a16c29d9b7f4989-refs/branch-heads/4758@{#972})
  Snap.ChromiumVersion:
   mkdir: cannot create directory '/run/user/0': Permission denied
   Chromium 98.0.4758.80 snap
  Tags:  impish
  Uname: Linux 5.13.0-28-generic x86_64
  UpgradeStatus: Upgraded to impish on 2021-10-12 (121 days ago)
  UserGroups: N/A
  _MarkForUpload: True

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