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Netbeans 4.0 beta2 Everytime I restart netbeans I get the "scanning project Classpaths" dialog flashing on the screen (I think it is appearing/disappearing continuously. It says "Initializing scanning . Please wait...". If I'm really quick I can select to do a rebuild all between the dialog appearing - but it doesn't help. Deleting the cache directory doesn't help either (although it did initially). Basically I have to delete my netbeans userprofile directory and recreate it each time to use the product (and then re-add my projects).
Perhaps dup of issue 50433.
Caused by issue 50431. See issue 50433 for the details of what causes this. Some of your project XML/property files probably contains a classpath element in non-normalized form. There was a bug in the project system that caused that the URL did not get normalized after reading from the project xml/property file which causes this problem. It was fixed some time ago. You should probably download the most recent q-build. *** This issue has been marked as a duplicate of 50433 ***