I have about 600 sms in my K750i(hacked)
Now I want to delete some or many of them with a view first, but when I tried to sync with MPX it downloaded just 20 of them.
MyPhoneExplorer was tested with 20.000 messages without problem (i used a C902 for this stress-test). i think your problem is related to your patches which you did on phone, if you want you can post the logfile after refresh here.