Hi, it could be what you say but I am more inclined to think that maybe there was a bit of wallpaper paste on the paper when you painted. If this is the case try wiping it off where the crazy paving affect is. If it comes off then that is what it was, then you can give it another coat and all should be fine. Let us know how you get on.
Hi, if it is just the fact that the paper hadn't dried properly then just wait for a couple of days after papering to make sure it is fully dry then give another coat or 2 and that should cover up the cracks. If however if it is paste on the paper then you will need to get rid of it before you put on another coat or it will just crack again.
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