Couldn't resist sharing this!
I finally saw I had 50 credits at Fotolia, given that I no longer upload to them due to their truly feeble payment rates. But when I tried to convert the credits into money, I could not do so, so I contacted Support.
Their reply posted below!
I've not seen a decimal like that since I left school!!!!
What precision.....!
The figure of 50 credits you are seeing is rounded up. You currently have 49.9955 credits available. After your next sale you will be able to convert your credits.