[NTG-context] Synctex problems with context and texworks

Hello there, sind yesterday the pdf-view with synctex had no problems. But today, without any change (afaik), it does not work anymore. The arguments for compiling with context.exe are --synctex $fullname That is default. I deleted the .synctex.gz files manually, but it did not help. What could be the problem? Thanks Huseyin