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It could be a number of things - I experienced something very similar on UPK 3.6.1 a short while ago, and after applying the Service Enablement Pack 3, everything just sprang to life! I am not too sure what version of UPK you are using, but ensure that the compatibilities between the browser and your version of UPK (including any service packs) are in line. You can download any of the enablement packs on edelivery.
Have you attempted to launch play.exe in a different browser? Does it do the same thing? If this is not the case, then you can localise the issue to the browser itself; for instance, you may have 'zoomed in' on the browser, and the player can no longer function correctly unless you 'zoom out' again. You can achieve zooming in and out of a browser by holding down the CTRL key and using the wheel of your mouse to zoom in or out as required.
Also be aware of the screen resolution that the content was recorded on - if it is the same or similar to yours, it shouldn't be an issue, but there are cases where content is created on devlopers that have a much higher resolution, and then users with lower resolutions cannot view that content online (this is assuming that you are working on a multi-user environment, or whether you have imported external content into your developer client).
I hope that helps a bit.