Problem with Cydia

All of a sudden when I start Cydia on my iPhone 5 FW 6.1 it got minimized and goes to left upper corner of the screen. It is not totally dead but it dose not respond.
The only new thing I did is I install Deck tweak , I want to uninstall it but Cydia dose not open and can't do itI turn it off from setting but that dose not make any deference .
Is there any problem with Cydia ??? or is it me alone ???
Thank you.

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