A agree with Jigs. I had exactly same thing happen to me:
HyperGrid literally reached into the OSGrid Inventory System and corrupted my avatar's Inventory of objects, body parts, textures, scripted attachments, hair, etc. These items still appear listed in my inventory, but they are gone FOREVER.
Fortunately, I keep backup copies of my inventory and avatar objects using a variety of methods, including IAR and OAR.
I once was an active cheerleader for HyperGrid, but since that catastrophic HG version was released upon OpenSim metaverse, I have actively informed friends and noobs about the risk of losing everything by using HyperGrid.
In fact, I put a big "Use at your own risk" sign in red hovertext in front of my HyperGate!
Since each region owner using HyperGrid controls which version of HyperGrid and OpenSim server version they use, It will be a long time before this awful problem totally subsides. HG will need to achieve a longer track record, perhaps another year, before I recommend it to common users.