Not common at all unless IH4 is not installed correctly or if your server is configured using old configuration specifications and therefore blocks the auto installer.. Post your image settings (ALL of them not just the IH image settings).. Can't help by guessing.. need more details.. Do you have any other image mods installed?? a lightbox perhaps???
You should know that IH4 has not been yet updated for the current version of Zen Cart.. The yet unreleased updated version is on my GitHub repo (link posted here a page or two back). Doubtful that this is a version incompatibility issue though.. But wanted to throw that out there..
BTW, the image hover only works on the small images.. It doesn't apply to the image on the products info page (as is explained in the readme and in this support thread)
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