I would also do a reboot of the computer to take anything out of resident memory, and then do a disk defrag on a hard disk or a optimize on a ssd then do the install...

Slic3r should be working in MatterControl 1.5 on Linux. It is only currently broken on the Mac. If you want to post your slice settings file and maybe an example STL, we can try to see what is going wrong. You can also try to diagnose it yourself.

If you want to try building from source, stay on the master branch and see this article for hooking up Slic3r.

Does this error happen only with the specific model that you are trying to print, or with all models? This sounds like an issue with the model rather than the slicer or MatterControl, but will need more information to be sure.

If it is the model, there are a few things to ensure:

* Is the model manifold? This basically means that if you were to theoretically use the model's inner volume to contain water, will any leak out after you shake it? I don't know about other tools, but if you open the model in Blender, go into edit mode on the model, and press Ctrl+Alt+Shift+M, all non-manifold vertices will auto-select and you can tell right away where your problem points are.

* Is the model too complex. Slicing can take up a lot of memory on your PC, at some point a model with too much geometry will need more memory than your PC has to spare, causing it to crash or throw an exception.