[Beta 5] UI Bug: Large numbers of in-development buildings blocks UI

Version 0.5.7567 on Win7-64 bit

Found the following in a single player skirmish:

I paused the game and implemented a number of building orders.  This totaled about 15, and each generated a thumbnail image of the building under development.  Each of these 15 thumbnails was placed in a row across the screen, such that the last few overlapped the game control UI in the top-right corner.  Even though I could see the game speed controls underneath / between the thumbnails, the buttons were not responsive when I clicked them.  In fact, the game was stuck in pause until I looked up hotkey commands for game speed and was able to resume play.

Observed: game speed and other UI controls unavailable with sufficient number of buildings in production

Expected: game speed and other UI always accessible

Please let me know if any additional information is needed.