That freezing is a known bug when trying to work with bridge from estk.
Easiest way to unfreeze is click the bridge window and back to estk. It's a pain, but the debugger is worth it.
Once you are in the debugger, it's pretty much standard fare for debugging. It certainly beats the heck out of alerts and what not.
When attempting to execute a bridge script or command line from the console, you can switch the app drop down list from bridge to estk and back to bridge and the script/line will execute and return.
Don't forget about the $ object.
$.writeln in your bridge code will write to the estk console. That's also much better than alerts.
Bob