With the most recent update to PM, I'm having an intermittent problem with sequential numbering in the rename images function. I don't think it is user driven, but it seems to be related to some combination of steps.
My normal process is to use a card reader for ingest. When I insert a CF card in my card reader connected to my Windows 8.1 laptop, PM launches if not already open and the Ingest dialog window opens. The ingest dialog window sometimes is resetting the sequential count for file names - and sometimes not. If it does not correctly set the sequential number, I have to manually set it to the correct number.
There may be a connection with using the renaming function and the sequential number - although I do not use that function often.
I have never run into this issue with earlier versions.