Could you please try turning off reader X protected mode and check if you continue to see the problem?
You could turn off protected mode using following steps:
1. Launch Reader X and select Edit->Preferences...
2. Select General from left navigation
3. Under application startup uncheck "Enable Protected Mode at Startup"
Note: You should switch "ON" protected mode after verifying the problem. Purpose of Reader X Protected Mode is to keep your system safe from PDF based exploits and keeping protected mode OFF will leave your system vulnerable.
Thanks for your suggestion but after i turned off the "protected Mode" and restart the Reader i have the same problem an d all printers are unsortet.
Have you other ideas ?
Thanks in advance
Adobe is displaying the list in the order that the printers were installed on that machine. It must be a glitch with the way Adobe displays the list of printers. You could fix it by uninstalling all the printers (locally) and then re-installing in alphabetical order..