I run phoca Maps 2.0.1 on j1.7.0 with a lot of markers (aprox 1800). If i whant to sort by maps in pulldown menue the ist jumps always back to "select maps" ad nothing happens

The same problem i had before in update (rum j1.6.5 and phoca 2.0.0)
Any ideas how i can solve this problem?
thanks
hans