Hello,
Thank you for the bug report.
Can you please let me know what specific v5.0 build you are using?
I have reviewed the problem and I was able to reproduce it.
This issue occurs when the setting
Include "Edits and Upload" in edit history is checked and is not related to filenames containing a hyphen, this appears to be a coincidence. If the file was previously edited remotely and in the history then it wasn't added.
If you're currently using v5.0.0 build 3804 then you can simply download this updated flashfxp.exe to test my fix.
Download ffxp5.0.0.3804-r4.zip
Unzip the FlashFXP.exe into your FlashFXP program folder overwriting the existing FlashFXP.exe