After updating rsformpro to latest version 1.51.4 I get a 406 page error when clicking save or cancel on the component configuration page.

Also when viewing details layout in the submission directory clicking download pdf generates a blank page. Any idea why this could be happening?

The site is not live so cannot share link to it.

Also, I'd like to ask the RS Joomla team to implement some kind of update verification process. 3-4 updates in 2 days is freaking annoying when one has like 10-12 websites to update.
PLEASE do something about it.

You are more then welcome to submit a support request for the 406 error so we can have a closer look at this.

Version 1.51 was a major update, naturally some small bugs slipped through. As soon as functionality issues are reported we release fixes for them. Given that these aren't affecting all installations, especially if these don't affect your implementations, you can wait for a few days before updating.

PS: The overall Joomla! update process makes things a lot easier. You just need a couple of clicks to update your installation.

Thank you for the offer of help alex. I think it's good also to post these things in the forum so others can see what ended up being the issue as well as the fix before submitting a support ticket.

It tuns out there was nothing wrong with rsform. I think it was something I did with overrides to core files. I was using Joomla 2.5 but after updating some components I decided to finally upgrade to Joomla 3 and after getting that done rsform is working perfect again.