I had installed Openlayers. I then installed the Zen theme and many other modules and made many changes irrelevant to the Openlayers module without checking anything so far. I then tried to see what I had actually done and all of a sudden, the whole map(map tiles and overlay images) were stripped and squized and I couldn't understand why. Today, I found out the reason thanks to https://github.com/zurb/foundation/issues/26.
Zen (sub)theme includes by default the following statement in one of its CSS files:
img { max-width: 100%; }
Google/Yahoo/Openlayers Maps don't play well with this and it needs to be overriden to:
img { max-width:none; }
.
This bug was encountered in Firefox. I haven't checked other browsers but I suspect it's global.
Needs review
2.0
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