Yesterday I spent two hours on debugging one of my applications and searching for an answer. Of course, the problem was caused by myself. Here is what happened:
I copied a page and deleted the region including buttons and items using the Cascade to Delete Buttons option.
Then I created a form and had there a process on submit to upload files in my table. Everything was working fine except the fact that after the process the page would show up empty having the funny
Looking at the page I couldn't see anything what would point to the actual problem. The process was there and it was running and the branch was there. Only after a while I looked into the branching and saw there that it was conditional - firing when the deleted button was pressed.
Then it came to my mind that this wasn't the first time I had this problem. I think this is a bug and it has to do with the file browse item. I expected the page to redirect after submit since this feature is there since 4.0. However, it didn't. This issue seems to be fixed in 5.0.
And one more thing to add: It does make sense to create conditional branches but it doesn't make sense to create unconditional ones. The feature of creating unconditional branches to the actual page, where the branch resides, should be removed completely.
You can see it in "action" here