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I was able to resolve the issue at my end by removing any variables under [Starting Variable Values] that were being set to blank using %(DB.NULL). Not sure why, but it looks like that special variable causes the Set Business Process Variables to hang. You may want to also try removing references to system variables, and use Tokens only. Or, alternatively, bridge a system variable to a token and then use the token instead. 

Hope this helps!

That is part of what is so frustrating.  I only have the ONE variable that I am even working with.  I will try to use a token again, but I am very certain I did try that earlier today.  I'll give it another shot though.

Yeah I noticed that in your original screenshot which is why I mentioned trying to bridge it using a token, in case it was an issue/bug setting special/system variables directly using the Set Business Process Variables activity.

Let me know if you need an example of how to bridge a variable using a token and I can post a screenshot

Regardless, best of luck, hope you get it working!

I have had that a few times.  Its been an ongoing random thing since before 11.  I would start a support case.  We have had it in the past and were given an extensive SQL script to run where we had to enter the instance ID and it went and updated all the forms variables to get it to update correctly.  Not sure if that is still done but it was the only want to continue a pretty extensive process.

Kris, I am not sure what you mean by bridging unless you mean creating a token that is populated with the submission ID from the input parameters of the form.  Then using the token to update the business process variables.  I have already tried that.  Actually, on every workflow log and in every attempted means of updating the variable, the output is logged as the accurate number.
 

Chris, I have a support call at 1 today.  This has just been blowing my mind.

Hi Christa, yep, that's bridging. Sorry to hear it didn't work. 

Please do report back what you hear from LF - I'd be interested to know if it is a bug or there is a workaround just in case I come across it happening again. 

Good luck!

Well, whatever I am dealing with is bigger than just my form.  A bit ago I created a whole new form (2 fields) and created a new workflow to update the business process variables.  I cannot update the process variables through a created token, hard coded value, system variable or any other means.  They are also suspending.  However, in all cases, the value is showing accurately in the workflow log.  Heh.  I even made a sql table with only a PK and entry value where i can write a unique name to the table then query for the PK of that entry to plug that in as a sequential ID.  STILL no dice on any of it.