Thread: Eclipse - Everything suddenly broken due to compliance level

Ok, so something weird has happened, and I'm not sure how to fix it. I am using Eclipse.
All of my projects would appear to think that it is using some JDK compliance level below 1.5. They were working yesterday. I started up Eclipse today, and everything is suddenly broken.

Under Preferences > Java > Compiler, I have the JDK Compliance Level set to: 1.7
Under Preferences > Java > Installed JREs, I have jdk1.7.0_45 checked as default and as the only installed JRE
Furthermore, the projects have the jdk1.7.0_45 as the defined JRE System Library in their Java Build Path. And the projects are not enabled with project specific settings.

I am getting errors for annotations, enum keywords, ect., all telling me I need to change the project or workspace compliance and JRE to 1.5 or greater. As far as I can tell, they already are...

Any thoughts?

Windows 7. I've done system updates and I've cleared my system's temp folder.

I think I may have sorted it out, but I'm not happy with the solution. I pressed the: "change project to 1.5 compliance" or whatever popup on an error message for one of my projects. That set the JRE to 1.5 and turned on the "enable with project specific settings" checkbox in the project's compiler settings. I then manually set the JRE back to 1.7 and unchecked the "enable with project specific settings" and it is all fine again for every project...

The best I can guess is that Eclipse "forgot" what it was set to, and would only accept my manual changes if it first did its automatic change for some stupid reason. Who knows...Eclipse works in mysterious ways sometimes.