It happen again and this time log was writed:
---------------------------11.10.2006 16:08:28---------------------------
Exception 'EAccessViolation' in module plsqldev.exe at 00505C0C
Access violation at address 00906C0C in module 'plsqldev.exe'. Read of address 00000000
Call stack:
:00906C0C...
We are upgrade some intances of Oracle (HPUX) from 9206(9205) to 9208.
And now when I press execute query PL/SQLDev crashes "Access Violation at address 00000000. Read of address 00000000." Crashes occur very often may be each 20-th execute. Sometimes SQLDev close after closing message...