>>- manually pack the project - open it as a table, issue "blank all fields objcode, timestamp", close, rebuild.
>>
>>I was never sure of which one really worked, but it almost always did. Only a couple of times I had to build the project from scratch.
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>looked in my pjx table. i see a field called TIMESTAMP , but not one called OBJCODE ... i do see a field named OBJECT ... is that the one to clear ?

Yes. It's Objcode in classes and forms, and Object in projects. Don't know why they used different names. It contains compiled code, properties and even full paths to the source, probably as debugging info.