[Q] Can't set default apps topic

I had a problem with gallery not working so downloaded quickpics and was using default app manger to change settings. Firstly, there was no default app set for most things e.g camera, gallery, browser etc. I selected gallery and it gave me a list of apps to select as the default app - but I couldn't select any of them - I mean they couldn't be clicked to select.

I opened a picture (after freezing gallery in Titanium Backup) and it asked me which app I wanted to open it, I chose Quick Pic and ticked the set this as default app. But in Quick Pic settings the default app part is greyed out even though pictures now open with Quickpic.

I am unable to set any apps as default in my stock 4.3 rooted S3 LTE. Why is this. Any help would be soooooo appreciated.

Thanks in advance

Z