Follow-up Comment #8, bug #19896 (project mypaint):

Version o MyPaint: 1.0.0+git20120121.b8338d5-1ppa1~natty1
Video: it's similar but in my case much, much less frequent.
Debug data:

DEBUG: ex=973.056 ey=512.352 p=0.81640625 xt=None yt=None
ax=373.05600000000004 ay=424.352
DEBUG: ex=969.984 ey=511.77599999999995 p=0.896484375 xt=None yt=None
ax=369.98400000000004 ay=423.77599999999995
DEBUG: ex=966.144 ey=511.48799999999994 p=0.904296875 xt=None yt=None
ax=366.144 ay=423.48799999999994
DEBUG: ex=0.0 ey=0.0 p=0.904296875 xt=None yt=None ax=-600.0 ay=-88.0
DEBUG: ex=0.0 ey=0.0 p=None xt=None yt=None ax=-600.0 ay=-88.0
device change: Core Pointer <enum GDK_SOURCE_MOUSE of type GdkInputSource>
DEBUG: ex=959.616 ey=514.3679999999999 p=0.98828125 xt=None yt=None ax=359.616
ay=426.36799999999994
device change: ACECAD USB Graphics Tablet  <enum GDK_SOURCE_MOUSE of type
GdkInputSource>
DEBUG: ex=958.464 ey=516.6719999999999 p=0.94921875 xt=None yt=None
ax=358.46400000000006 ay=428.6719999999999
DEBUG: ex=957.312 ey=518.976 p=0.98046875 xt=None yt=None ax=357.312
ay=430.976
DEBUG: ex=956.16 ey=521.28 p=0.94140625 xt=None yt=None ax=356.15999999999997
ay=433.28

Another one:
DEBUG: ex=973.056 ey=512.352 p=0.81640625 xt=None yt=None
ax=373.05600000000004 ay=424.352
DEBUG: ex=969.984 ey=511.77599999999995 p=0.896484375 xt=None yt=None
ax=369.98400000000004 ay=423.77599999999995
DEBUG: ex=966.144 ey=511.48799999999994 p=0.904296875 xt=None yt=None
ax=366.144 ay=423.48799999999994
DEBUG: ex=0.0 ey=0.0 p=0.904296875 xt=None yt=None ax=-600.0 ay=-88.0
DEBUG: ex=0.0 ey=0.0 p=None xt=None yt=None ax=-600.0 ay=-88.0
device change: Core Pointer <enum GDK_SOURCE_MOUSE of type GdkInputSource>
DEBUG: ex=959.616 ey=514.3679999999999 p=0.98828125 xt=None yt=None ax=359.616
ay=426.36799999999994
device change: ACECAD USB Graphics Tablet  <enum GDK_SOURCE_MOUSE of type
GdkInputSource>
DEBUG: ex=958.464 ey=516.6719999999999 p=0.94921875 xt=None yt=None
ax=358.46400000000006 ay=428.6719999999999
DEBUG: ex=957.312 ey=518.976 p=0.98046875 xt=None yt=None ax=357.312
ay=430.976
DEBUG: ex=956.16 ey=521.28 p=0.94140625 xt=None yt=None ax=356.15999999999997
ay=433.28

And again:
DEBUG: ex=787.2 ey=615.4559999999999 p=0.837890625 xt=None yt=None
ax=187.20000000000005 ay=527.4559999999999
DEBUG: ex=787.2 ey=606.24 p=0.837890625 xt=None yt=None ax=187.20000000000005
ay=518.24
DEBUG: ex=0.0 ey=0.0 p=0.888671875 xt=None yt=None ax=-600.0 ay=-88.0
DEBUG: ex=0.0 ey=0.0 p=None xt=None yt=None ax=-600.0 ay=-88.0
device change: Core Pointer <enum GDK_SOURCE_MOUSE of type GdkInputSource>
DEBUG: ex=0.0 ey=0.0 p=0.875 xt=None yt=None ax=-600.0 ay=-88.0
device change: ACECAD USB Graphics Tablet  <enum GDK_SOURCE_MOUSE of type
GdkInputSource>
DEBUG: ex=787.968 ey=576.5759999999999 p=0.91796875 xt=None yt=None
ax=187.96799999999996 ay=488.5759999999999

There is always the "device change" info in terminal when it happens
apparently.

I'll definitely test any fixes you might have. I don't know Python much, but I
might learn a little.
Disconnecting mouse and using only tablet didn't help, still an error:

DEBUG: ex=1027.584 ey=427.67999999999995 p=0.36328125 xt=None yt=None
ax=427.58400000000006 ay=339.67999999999995
DEBUG: ex=0.0 ey=0.0 p=0.349609375 xt=None yt=None ax=-600.0 ay=-88.0
DEBUG: ex=0.0 ey=0.0 p=None xt=None yt=None ax=-600.0 ay=-88.0
device change: Core Pointer <enum GDK_SOURCE_MOUSE of type GdkInputSource>
DEBUG: ex=1034.88 ey=434.88 p=0.396484375 xt=None yt=None ax=434.8800000000001
ay=346.88
device change: ACECAD USB Graphics Tablet  <enum GDK_SOURCE_MOUSE of type
GdkInputSource>
DEBUG: ex=1035.648 ey=442.36799999999994 p=0.5078125 xt=None yt=None
ax=435.6479999999999 ay=354.36799999999994


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