Can't delete files via NFS shares on Mac, but can on Synology (Infuse Pro)

I have Infuse 5 Pro accessing NFS shares on my Synology and my Mac Mini running Snow Leopard Server. Infuse can successfully delete a video file on the Synology, but not on the Mac. It just says, unhelpfully, that an “error occurred.” Is there any to find out what error?

In comparison, MrMC is able to successfully delete a video file from the NFS shares on my Mac. So, is MrMC handling NFS shares differently than Infuse?

Also, Infuse 5 for iOS can’t connect to my Mac NFS shares at all.

Any suggestions on what could be wrong? Any way to get more details on the exact nature of the error?