Fixture Builder caused show file to become unusable

I have been running HOG 3PC very successfully for a few years now and have always been able to create fixtures on the fly with no problems. However I have recently bought a new PC and installed v3.1.6 (b2773). Everything has run pretty smoothly until I tried to create a new personality. The personality created and was patchable and usable until I logged out of the show. Now I can't log back into the show. If i create any kind of fixture it doesn't seem to allow me to ever use the show again. I have tried creating backups and they wont load and I can't merge the original show. Any ideas?

Cheers

Richard Wolfgang
LD - Lacuna Coil
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