Dear Stefan

I have a problem considering binary data files.
Usually binary files start with TIME... (the time calibration header). But I observed the following reproducible problem.
1. Start to save a binary file (e.g. 001.dat) with 1000000 events. 
2. Hit the close button before this limit has reached. (so far the binary files seems to be ok) 
3. Start to save again a file with the SAME filename (and agree to replace the already existing it)
If I do it like this, the file has no time information anymore and starts directly with EHDR.

could it be that the m_evSerial counter is not reset in this specific situation?

Cheers,
Roman