Steps to reproduce:

1. Make a Handy Bag
2. Insert Memory Card (I used a 12B)
3. Upgrade to Large
4. Memory Cards and Contents will be wiped

Version: enderutilities-1.10.2-0.6.5

Item loss was thankfully minimal, and your mod is awesome despite the bugs.

I think I'll actually try to run a set of testing and get a 0.6.6 bugfix/feature tweak release out today. I was kind of going to hold off and cram some new stuff in and release it as a 0.7.0. But since there have been quite a bunch of feature tweaks/additions to old items, and some bug fixes in these several months since the previous release (and I don't know how long adding the new things will take still...), I think I'll go ahead and release a 0.6.6 instead to get these fixes etc. available for players.

Edit: Okay my eye caught your word bugs. Are there other bugs you are aware of, that haven't been fixed yet (if you look at the commit history since the previous release in July)?

Oh I was just referring to "that fix (and many other fixes...)" :D

Ah okay, hehe :D

This has actually been fixed in commit 06bac2d, but since I haven't made a new release since last July, that fix (and many other fixes...) still aren't in a released version...

And sorry about the presumed item loss... >_>

The fix to this was included in the release 0.6.6.