Are you installing from the Asset Store?
You may be running into the Asset Store bug where it imports the wrong version for the current version of Unity. More info and solution here:
https://hutonggames.com/playmakerforum/index.php?topic=20177.msg91723#msg91723

You should be able to use PlayMaker > Tools > Export/Import Globals to merge globals from another project. Export Globals in the old project and use Import Globals in the new project to merge with existing Globals.

Let me know if you run into problems with this and I'll take a look...

We’re looking for an artist/graphic designer who knows Playmaker and can work remotely. Contract position only, please send enquiries with your cv/work samples to info@hutonggames.com, subject line - ArtMaker 

Great art style and looks fun - I'll check it out!

Can anyone still seeing this post the full Playmaker and Unity version info found in the About windows. Also if you can submit a bug report it will give us more system info to help us track down the issue. Thanks!

There shouldn't be a problem with scripting runtime 4.x.
What's the full Playmaker version in PlayMaker > Help > About.
Also the full Unity version (it may be an issue with a specific version of Unity).

Strange. I haven't seen this before.
Does it stop if you re-boot Unity?

Can you open PlayMaker Editor > Preferences > Experimental
and check that Error Check Timeslice is 100 and Action Usage Timeslice is 50.

You could try raising these numbers. E.g., make Action Usage Timeslice 200.

If that doesn't work, you could turn off "Auto Refresh Action Usage" in the Action Browser settings (the small gear in the top right corner).

In the next update, the progress bar is on the same line as the search field, to avoid the list jumping up and down when updating. But I'd still like to figure out why this is happening...

Strange! What versions of Playmaker and Unity?
Are there any log errors in logcat?