On MSP area, it is extremely important to make sure that the MSP compatibilities for 13.3 are respected:
- MSP 2010 SP2
- MSP 2013 RTM (no patch installed at all, not even SP1, which is explicitly unsupported)
MSP support on Windows 10 should be checked with Microsoft.
I am not aware of other than browser issues (caused by IE11 used on 13.3 anyway; IE11 needs to run in IE10 compatibility mode); but my personal recommendation would be to try with Chrome instead. Firefox v41 and higher have important issues on 13.3.
I would still encourage you to consider upgrading to a supported version soon :-)
Hope this helps.
Regards,
Marc