I've seen other posts claiming this has been resolved, but we're still seeing this issue as off the 2017.1.207 release.

When we run our test lists, we often run into memory issues using the Test Runner for Test Studio. We are sometimes not able to generate an .aiiresults file after executing a test list, even though we are still able to see the dump files (DOM dump, screenshots, log files, etc…). 

We’ve discovered the issue is with the Test Runner executables running out of available memory. Since they are only 32-bit applications, they are only able to access 2GB  of memory. We have used the recommended Large Address Aware tool to increase the amount of accessible memory to 3BG on a 64-bit OS, but even this is not sufficient at times. 

We’ve also had similar issues with the Test Results Viewer crashing when opening large .aiiresults files (>200MB). Again, running the LAA tool against the Results Viewer executable alleviates the problem, but eventually it returns once the test lists become large enough.