NanoNAS works flawlessly with all variants of windows up to XP-SP3 and Vista. It also works fine with MAC and any version of UNIX including the latest Ubuntu. That said, the best we can tell, Microsoft broke compatibility with a security update somewhere around XP-SP3 however we've been unable to pinpoint the exact time.
We have been working on the issue for some time now and have spent more time than I care to account for. As a result we have corrected a number of the problems that Vista has introduced. XP-SP3 can now delete without a problem and Vista can browse the server, but we still have some concerns about Vista and Win7 that we are currently working on.
Solution is very simple to implement, but requires relatively substantial increase in size requirements brought about by the increase in protocol complexity. That is room we do not have on the floppy. As a matter of fact there is only 28K available for us to implement the change. That will take some time if it's at all possible.
Following up on my post, I appreciate the new information. I would absolutely not be surprised to learn that MS caused the issue, and now you're left to deal with it. Since it occurs inconsistently, I'm sure it's been time-consuming to track down.
I use NanoNAS an old 486 clunker, which boots from floppy or HD -- and that's it -- so having a floppy-based NAS solution means I'm able to turn otherwise useless junk into a server for backups and other files. I used NasLITE for quite a while before that, and was delighted to see and pay for NanoNAS when it came out with new features.
The deletion bug isn't a complete show-stopper, as there are workarounds, including MOVING a file from the server to a local PC and deleting it from there. It is an annoyance, however, as it does occur frequently. Having no new information after confirmation of the problem except recommendations to buy a different product has been disappointing.
You mention that XPSP3 now no longer has problems. Was there an update to NanoNAS? I would be happy to test a new version if so. Alternatively, if there's no way to make it work, can you offer a migration path / discount for NanoNAS to NASLite2?