1. just to make sure that it's not a plugin or theme conflict, can you try the following:
- deactivating all other plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).
- switching to the default theme to rule out any theme-specific problems
2. Could do at some point. I'd imagine you can probably also do this by adding a link in your formats somehow.
e.g. in settings > formatting > maps > Location balloon format, add
" target="_blank">view map in new window</a>