Taken from the log file, because no error was displayed:
2006-04-04 11:16:21,354 [1006808] ERROR - .psi.impl.file.PsiFileImplUtil - psiFile==null:VirtualFile: E:\geoi2000\src\g2k\format\ZeissM5.fmt
2006-04-04 11:16:21,354 [1006808] ERROR - .psi.impl.file.PsiFileImplUtil - IntelliJ IDEA 5.1.1 Build #4188
2006-04-04 11:16:21,354 [1006808] ERROR - .psi.impl.file.PsiFileImplUtil - JDK: 1.5.0_06
2006-04-04 11:16:21,354 [1006808] ERROR - .psi.impl.file.PsiFileImplUtil - VM: Java HotSpot(TM) Client VM
2006-04-04 11:16:21,354 [1006808] ERROR - .psi.impl.file.PsiFileImplUtil - Vendor: Sun Microsystems Inc.
2006-04-04 11:16:21,354 [1006808] ERROR - .psi.impl.file.PsiFileImplUtil - OS: Windows 2000
2006-04-04 11:16:21,354 [1006808] ERROR - .psi.impl.file.PsiFileImplUtil - Last Action: FindInPath
2006-04-04 11:16:21,354 [1006808] ERROR - .psi.impl.file.PsiFileImplUtil - psiFile==null:VirtualFile: E:\geoi2000\src\g2k\format\ZeissM5.fmt
java.lang.Throwable
at com.intellij.openapi.diagnostic.Logger.error(Logger.java:47)
at com.intellij.psi.impl.file.PsiFileImplUtil.getPsiFilesByVirtualFiles(PsiFileImplUtil.java:14)
at com.intellij.psi.impl.cache.impl.CacheManagerImpl.getFilesWithWord(CacheManagerImpl.java:26)
at com.intellij.psi.impl.cache.impl.CompositeCacheManager.getFilesWithWord(CompositeCacheManager.java:39)
at com.intellij.find.impl.FindInProjectUtil.b(FindInProjectUtil.java:74)
at com.intellij.find.impl.FindInProjectUtil.access$100(FindInProjectUtil.java:113)
at com.intellij.find.impl.FindInProjectUtil$7.compute(FindInProjectUtil.java:2)
at com.intellij.find.impl.FindInProjectUtil$7.compute(FindInProjectUtil.java)
at com.intellij.openapi.application.impl.ApplicationImpl$7.run(ApplicationImpl.java)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:422)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:350)
at com.intellij.find.impl.FindInProjectUtil.a(FindInProjectUtil.java:3)
at com.intellij.find.impl.FindInProjectUtil.findUsages(FindInProjectUtil.java:34)
at com.intellij.find.findInProject.FindInProjectManager$1$1.generate(FindInProjectManager.java:1)
at com.intellij.usages.impl.UsageViewManagerImpl$SearchForUsagesRunnable.searchUsages(UsageViewManagerImpl.java:235)
at com.intellij.usages.impl.UsageViewManagerImpl$SearchForUsagesRunnable.access$000(UsageViewManagerImpl.java:183)
at com.intellij.usages.impl.UsageViewManagerImpl$1.run(UsageViewManagerImpl.java:125)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcess(ProgressManagerImpl.java:46)
at com.intellij.usages.impl.UsageViewImplUtil$1.run(UsageViewImplUtil.java:40)Issue was resolved
It's much easier to delete your system\caches directory - the bug should go away after that.
We're all for making people more productive with their work so if you feel moving to Eclipse will make you more productive - go ahead then!
Exception is fixed though.
I can't try out at the moment, because I'm working on a different location now, but I'm sure, I could open them in the editor in the last weeks and haven't changed the file settings in the last year. If I don't forget, I'll try next week.