I have compared the changes between v7.45 and v7.46 but have not been able to spot any obvious issues. There are hundreds of changes across fifty or so files, however the most critical changes are those to floating point precision, flushing files to disk during copy/move, regular expressions, and URL extraction.
In addition to checking whether this issue happens when you use v7.45 (which will narrow it down to an issue with v7.46), if you type "/debug on" in the status window, this will write server events to a debug.log file. After a crash, can you post the last few lines of your debug.log here? It may be that the crash is due to a specific server event. Thanks.
