No theme available after 3.6 update on multisite

Hi,

I’ve got a weird issue. I’ve a multisite wordpress network running 10 websites with domain mapping. Basically, each site has its own url.

Until 3.5.2 : worked perfectly.

After the update to 3.6, on “appearance” option for each blogs, I just have the current theme available, not the other one.

I’ve tried to de-activate / re-activate all the theme = no way. I’m connected on each blog has super-admin and still, I can see only the current theme.

Is there any new “tags” to add on theme to make it works on multiste network ? Or something else to do ? Because I can’t see nothing about this issue but I’ll be surprise to be the only one in this case ??

Thanks in advance for your help !