Dear Martin Prikryl,
I think your program is magnificent and I hope to provide you with the necessary information to tackle the problem:
WinSCP Version 5.7.6.
OS Name Microsoft Windows 7 Professional
Version 6.1.7601 Service Pack 1 Build 7601
System Manufacturer LENOVO
System Model 20DLCTO1WW
System Type x64-based PC
Processor Intel(R) Core(TM) i7-5600U CPU @ 2.60GHz, 2601 Mhz, 2 Core(s), 4 Logical Processor(s)
here my steps:
1) click "Synchronize"
2) click "Transfer Settings" (screenshot)
3) go to "Other: > "File Mask"
4) writting mask into field
5) click OK > close "Transfer Settings"
6) click checkmark "Use same option next time" (screenshot)
7) OK
8) The Task is then flawlessly executed by WinSCP
9) but in the following synchronization, the mask in the "Use same option next time" has disappeared and the checkmark is empty
10) and that means I have to go to step 3 and repeat procedure (screenshot)
best
Hans