If you are using Git you may be interested in the Git Console that was recently added as a ReadyAPI update. This integration will let you make .git calls directly from the console after connecting to your remote repository. For more information on the Git Console please visit the link below.
Yep. That is strange problem. Not one I can reproduce. I can only suggest a work around and see if that helps...
Instead of having assertions on the api invoke test step, maybe have the assertions in a groovy test step. Is the issue only related to assertions in one api invoke test step for one test case or assertions in any api test step in all test cases?
I prefer assertions in a groovy test step so they are not buried deep in the api invoke test step that I have to crack open each assertion to see what it is evaluating. I like to see all the assertions in code at one time.
This issue does not seem to be wide spread (at least others are not reporting it) so that leads me to believe something is specific to your situation. Is it a big project or one that has been modified a lot by different people with different versions of ReadyAPI? Maybe save it back to a monolithic xml project and then back to a composite project to see if it heals. I don't have an answer.