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I'm not sure if its already a known issue or anything, but I found this as possibly a bug when I was using v.2.0.14-RC1:
top page does not exist, in a sense, as any blocks I had set to be viewed on only the top page did not display at all, however if I displayed them on all pages, they viewed just fine.
I also found that the bottom blocks (bottom center left/right/center) have issues when you edit group block access rights. For example:
I had 4 blocks in 4 corners (left/right center and bottom left/right center). The bottom blocks do not appear in the group block access rights menu, and, one time when I edited a group that could view one of the bottom blocks, they lost the ability to view them, thereby removing them from the block menu for that group and orphaning that block.
I had a whole topic on it in the newbie corner (since I am just new to this) that might explain better:
https://xoops.org/modules/newbb/viewtopic.php?topic_id=50586&forum=27(Custom blocks do not show content)
hope that helps any.