I received this error when connected a database but idling (no active query and working in a different program).
Version 1.20.0 (Dec 19, 2014, rev: REL-1_20_0) on Windows 8.1 Pro (x64) "Unhandled exception at 0x0080B7C2 in pgadmin3.exe: 0xC0000005: Access violation reading location 0x4272BC2D.." Joel Finkel Sent in binary code using electronic digital computer technology and advanced internet routers and gateways. No bits were harmed in the creation or delivery of this message. We think. Please consider the environment before printing this email.