recommend use Europe 2011.20
if you have a map in internal menory in the garmin directory---that is attempting to display the same area--please remove it.
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every time your gps sees a different map-for the first time it adds its map segments to a internal table-
eventually that table becomes full and must be reset before more maps can be added-

when the map segment table gets close to full--expect locking up with a black screen-trouble locking on to sattlites
and won't load any more maps.

the problem is very common on very large maps --like europe.

try powering up--while pressing the lower right corner for 15 seconds--that will cause a factory reset--
it won't delete any maps but will delete all saved data---