I've hit a wall with a problem I'm having getting RC to work properly with FSX. I keep getting a 'run-time error 75 : RadarContact.fsuipc.rcv4code' when I click for clearance delivery once I've started RC. I have up until this point had no problem running RC on my computer which has a Windows 10 OS and Kaspersky Antivirus software. Disclaimer: I noticed this issue last night when I was playing FSX for the first time in 9-10 months. I'm not aware of any major changes made to my computer since then that could interfere with RC, which, as I mentioned has never given me a problem before. To troubleshoot, I ran RC as an administrator and then checked Kaspersky settings to make sure RC was listed as a trusted application, which it was. Those two things didn't work. I then uninstalled RC and reinstalled it and ran the program in FSX. At first, the clearance delivery went through and I thought the issue was solved. I closed out of RC and proceeded with my pre-flight setup. When I went to restart RC, I received the same error notice. I'm not sure what to do or what's preventing the program from operating correctly. Another disclaimer: my computer was upgraded to the Windows 10 OS from windows 7 OS. I can't remember if the upgrade occurred since I last played FSX but that could be a factor. Thanks in advance for your help in this matter.