This is a pre-existing Java project being run in Eclipse 3.5.2 32 bit..

Day 1:
Install Java SE 6 Update 20 JDK.
Experience Crash in Eclipse.
Install Java 5.
Same problem-(uninstall java 5).
Re-install Java 6.
Install Eclipse 3.3.1.
Install Eclipse 3.5.2. 32-bit.
No problems.
Run Eclipse 3.5.2. 64-bit.
No problems.
Set up the project, configure, and run.
No problems.

Day 2:

Load Eclipse to start a new project.
Previous project now has 940 errors.
Error Type is "Java Problem".

The project ran 100% without a problem on Day 1. The only thing that happened between Day 1 and Day 2 was restarting my computer. I just tried to recreate the project, step by step, and am still getting the same errors.

I know it's not the code -- it was working. Not to mention that it's an opensource project, such a problem would be documented.

I'm thinking something is wrong with my Java install. Or, perhaps, it's a 32-bit/64-bit problem. I'm running win7 64bit.

So before formatting my window's partition, I thought I'd throw the problem your way to see if anyone knows what's going on.

Thanks.