@AramUEAwe understand frustration, believe me. Please be mindful that the program developer, the plugin authors, the forum administrators & the moderators as well as other very helpful forumers are volunteers. Please be respectful of the time they put into creating all of this for free.
Honestly, 30 minutes is not that long to spend on creating an image but when you have something that you love you really don't want to lose it.
It seems that maybe you are running out of memory. Without anything else running in the background, like music or youtube - AVG should be fine as I run that too.
1. Open a new canvas to the dimensions that you require.
2. Now, yes, right now, save it - .PDN is what you need to save it as.
Are you able to provide a screenshot of the save window so we can see your configurations?
Does it get stuck on there too?
Let's see by the process of elimination what we can do to help you.