Sorry: previous post omitted Subject-update ! I was thinking how to edit my previous query to address the linux-X specialists, when I realised that I've omitted to mention that the crash occurs only when LEO is 'on-line' and being 'fed with input which N-O was designed to store in a display-frame'. AFAIK native oberon, collects bytes, eg. the mail-directory listing, in a variable, and then transfers it to the VDU-associated memory. Importantly, the byte-stream is not stored in a file. Now, N-O is able to quickly empty the 'variable of storage' into the VDU-associated memory, but LEO perhaps has to cooperate with linux's X-mechanism. All observed crashes occur when an inet derived byte-stream is not able to be displayed [stored in the 'display memory'] due to the display being used by a different desktop/task. Interestingly, I guess LEO would either need to 'hold back accepting inet-packets', or there'd need to be a extra temporary storage location/s. Is this related to the non/threaded modes/s ? TIA == Chris Glur.