After months of using Returnil in the Disc Cache mode, this is the first time I have seen a balloon pop-up to the effect that I have available 19MB out of a Cache size of 1340MB. Some details:- Session lock on. Light browsing -no large downloads. Running Sandboxed (Sandboxie). Restarted and defragged in safe mode for good measure ( the new version will be a blessing as the cache will be wiped on restart - there is no defrag possible with this version 200 5007, and I don't see defrag having anything to do with the Disc Cache being full ). Maybe switch to memory cache and then back to disc cache might be advisable, I don't know. Any ideas as to why this happened ?