EWQL: Unhandled Exception / Fatal Error

Hi, I'm a newbie here so please tolerate my ignorance. I have this trouble when saving a project file loaded with EWQL instruments and then close it and reopen it, the error occurrs. The msg reads:

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Error - Unhandled Exception
A fatal error has occurred.
Module: X:\...\play_vst.dll
A crash dump file has been created here
(dump link...)
Exception code: c0000005
address: 0896da5f:009a961a:0012e888
as a result of this error SONAR is about to exit abnormally.
Should SONAR attempt to save a recovery copy of your work?
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So just please help. Both my Sonar and EWQL are updated with the newest patches.
Thx