Rn-time error 55 when entering a route
I'm running build 400 of the Boeing CDU and I'm having great difficulty entering routes without encountering run-time error 55 - file already open.
Here is one example...
EGKK
Rwy 26L
LGAV
Rwy 03R
SID=BOGN1M
I press Route and the display shows BOGN1M.BOGNA in LSK4L and BOGNA in LSK4R.
I then press LSK5L to show available routes and select UN615.XAMAB and then press LSK5L to insert it into the plan.
I then press Next Page and press LSK1L. Nothing happens. the display remains blank. I wait 15 seconds and press LSK1L a second time.
BANG! Run-time error 55 - file already open.
This is very frustrating. I would love to enter my routes using this method but it just isn't reliable. I've just installed cycle 0813 but it has happened with previous cycles too.
Do I have a corrupt installation or are others suffering the same problem? As a programmer it would help if the error message was a bit more helpful. What file is already open? And why can't the routes be retrieved?