Problem running IDE 1.5.1

Hi!.

I'm running 1.5.1r2 and I'm having one annoying problem.

I often loose the debug information during compiling. I get a message saying that I've errors, but it doesn't point me to where the error is.

I fix this buy deleting the preferences.txt and then running the IDE1.01 to build the preferences.txt again.

After this, It works again in IDE 1.5.1r2.

But, after a while, i get again with same problem.

Anyone having this issue?