Using hdmi with external display crashes mac pro

I have late 2013 model Macbook pro. I have connected it via HDMI plug to external display via hdmi bridge. The other device connected to this hdmi bridge is a pc. Everything works fine until pc enters sleep mode, and switches display off. The result is immediate crash of my mbp either with reboot, or with screen requiring me to push power button long enough. Interestingly this problem seems not to appear if I am using this 30 bucks thunderbolt hdmi adapter. I am kind of infurious that my over 2 k MBP is crashing all the time. As the full-hd display works perfectly with PC, and with this extra adapter - what is the problem with my shiny premium MBP? anything to avoid this?

An articulating VESA mount and a cheap display or this Dell would be far simpler. The iMac G4 20" had to be specially weighted to hold just a 20" panel. 
This Dell in particular has a host of display connectors that Apple doesn't offer on it's panels so multiple devices can be connected simultaneously:
http://accessories.us.dell.com/sna/productdetail.aspx?sku=223-4890&cs=19&c=us&l= en&dgc=SS&cid=27530&lid=627063
cheers
mrtotes

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    Once I open the macbook display (such that I am working with both external and laptop display), I see these (add desktop button as well as preview of spaces), on the macbook display where as the big window at the bottom of the screen which shows each application is in the external monitor.
    Because of this, I cant use multiple spaces with external monitor only.
    Am I missing something or this is a bug??

    Posted on the wrong thread.

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