I've seen something similar, perhaps you may try
-close Revit sessions.
-text edit the affected version revit ini file from the affected user account from this location
\\workstation\c$\Users\username\AppData\Roaming\Autodesk\Revit\Autodesk Revit 20xx\
-within the revit.ini file
scroll to this entry
E.g
[Recent File List]
File1=..................rvt
File2=.............Roller Shutter.rfa
File3=..............rfa
File4=............................rfa
File8=.............................rfa
check that the files are numbered sequentially, corrected it to make it in running order e.g in our case, the File4 skipped to File8, rename File8 to File5
File1=..................rvt
File2=.............Roller Shutter.rfa
File3=..............rfa
File4=............................rfa
File5=.............................rfa
save the changes. try running the Revit program again.
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