I am currently using the latest 0.27.54, but actually this problem started with the previous version as well. Some times I will be executing "Anonymous Apex" code, and it will get stuck with the blue dots flowing back and forth along the top. If I try to execute again, it does the same thing (even after I restart Welkin Suite, or reboot my computer). Now it seems like I cannot run anonymous apex at all any more.
Any suggestions on what to try?