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Jul 5, 2015 4:54 PM in response to Martin O.by vaalMaker,I'm having the same issue with a Samsung monitor. In 10.10.4 Apple "Addresses an issue that prevented some external displays from functioning properly" (https://support.apple.com/en-us/HT204928). Apparently this made things worse for a lot of us.
Other, similar display issues caused as a result of the update have already been mentioned in these two threads:
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Jul 15, 2015 8:01 AM in response to Martin O.by vaalMaker,In case anyone is still having this issue I wanted to point out that I switched from a Mini DisplayPort to VGA converter to a Mini DisplayPort to HDMI cable and the issue seems to have gone away. My Mini DisplayPort to VGA converter was made by a third party and I suspect it was giving the graphics card trouble. It seemed to work fine with previous versions of OS X though, which is a little frustrating...