Problems with large DPI settings
This is fixed in version 1.5 which uses a new tab control with docking and splitting. Although V 1.5 ist still marked as 'alpha'/'test build' it is stable as 1.4 (I use 1.5 every day at work).
Problems with SFTP on 64bit systems
The ChilkatDotNet2.dll is for 32bit system. You can replace this by the 64bit version which can be downloaded here:
See this dicussion for details:
SFTP Fails to Open/Find File