Status: 0/unconfirmed
Date: 2015/5/3 19:51
To: GLM5zvjPHqwM3JmisZCqMJNYyxNFmiAb46
Debit: -1507.00 GPH
Transaction fee: -0.0001 GPH
Net amount: -1507.0001 GPH
Transaction ID: 780a8402f84c66da0985b058a028770be81bfdb46db804dcf815936421432089-000
Get in debug window/console in your Graph qt-wallet from Help menu.
Type 'repairwallet' and restart wallet. You should be ok. 
Im having the same issue on a transfer.. Repair wallet seems to acknowledge the transfer and issue, but when restarting wallet still not sending.
Try backing up your wallet.dat, then delete everything except your wallet.dat file in the %appdata% folder and re-sync. If this does not work, pm me and we will take a further look at things.