That has worked for me on my second system, hopefully when I can make the same change and it will work as well. Many thanks for the quick response.

I tried disabling checkforupdates and this did not help, the log now looks like this:- 03/06/2025 14:16:56 - Starting VarAC (V11.2.0) 03/06/2025 14:16:56 - OS: Microsoft Windows NT 6.2.9200.0 03/06/2025 14:16:56 - OS: Microsoft Windows NT 6.2.9200.0 03/06/2025 14:16:57 - Debug mode disabled 03/06/2025 14:17:00 - FREQ Schedule off 03/06/2025 14:17:01 - Unattended links enabled 03/06/2025 14:17:01 - Setting unattended links ON (load) 03/06/2025 14:17:01 - PSKReporter: logging enabled 03/06/2025 14:17:01 - PSKReporter: Connected 03/06/2025 14:17:02 - Advanced Mode enabled 03/06/2025 14:17:02 - Opening DB connection 03/06/2025 14:17:02 - Current VarAC DB version: 27 03/06/2025 14:17:02 - Applications launcher disabled 03/06/2025 14:17:09 - Connecting VARA Main Modem Command interface... 03/06/2025 14:17:09 - Connecting VARA Main Modem data stream... 03/06/2025 14:17:09 - Connecting VARA Main Modem KISS Command interface... 03/06/2025 14:17:09 - Connected to VARA modem 03/06/2025 14:17:09 - Setting Bandwith to 500Hz 03/06/2025 14:17:09 - Change frequency: to last frequency used before shutdown. 03/06/2025 14:17:10 - VarAC base directory: C:\VarAC\ 03/06/2025 14:17:10 - VARA version: VARA HF v4.8.9 Since doing this check last night other updates have happened and I can not longer remove the offending update without uninstalling all the subsequent updates. If you have any ideas on how to solve this problem it would be much appreciated.

I have disabled updates and it still lock up but one step earlier as follows. 02/06/2025 19:36:48 - Starting VarAC (V11.2.0) 02/06/2025 19:36:48 - OS: Microsoft Windows NT 6.2.9200.0 02/06/2025 19:36:48 - OS: Microsoft Windows NT 6.2.9200.0 02/06/2025 19:36:49 - Debug mode disabled 02/06/2025 19:36:52 - FREQ Schedule off 02/06/2025 19:36:53 - Unattended links enabled 02/06/2025 19:36:53 - Setting unattended links ON (load) 02/06/2025 19:36:53 - PSKReporter: logging enabled 02/06/2025 19:36:53 - PSKReporter: Connected 02/06/2025 19:36:53 - Advanced Mode enabled 02/06/2025 19:36:54 - Opening DB connection 02/06/2025 19:36:54 - Current VarAC DB version: 27 02/06/2025 19:36:54 - Applications launcher disabled 02/06/2025 19:37:01 - Connecting VARA Main Modem Command interface... 02/06/2025 19:37:01 - Connecting VARA Main Modem data stream... 02/06/2025 19:37:01 - Connecting VARA Main Modem KISS Command interface... 02/06/2025 19:37:01 - Connected to VARA modem 02/06/2025 19:37:01 - Setting Bandwith to 500Hz 02/06/2025 19:37:01 - Change frequency: to last frequency used before shutdown. 02/06/2025 19:37:01 - VarAC base directory: C:\VarAC\ 02/06/2025 19:37:01 - VARA version: VARA HF v4.8.9 02/06/2025 19:37:01 - Checking for VarAC update. 02/06/2025 19:39:34 - Starting VarAC (V11.2.0) 02/06/2025 19:39:34 - OS: Microsoft Windows NT 6.2.9200.0 02/06/2025 19:39:34 - OS: Microsoft Windows NT 6.2.9200.0 02/06/2025 19:39:34 - Debug mode disabled 02/06/2025 19:39:37 - FREQ Schedule off 02/06/2025 19:39:37 - Unattended links enabled 02/06/2025 19:39:37 - Setting unattended links ON (load) 02/06/2025 19:39:37 - PSKReporter: logging enabled 02/06/2025 19:39:37 - PSKReporter: Connected 02/06/2025 19:39:37 - Advanced Mode enabled 02/06/2025 19:39:38 - Opening DB connection 02/06/2025 19:39:38 - Current VarAC DB version: 27 02/06/2025 19:39:38 - Applications launcher disabled 02/06/2025 19:39:43 - Connecting VARA Main Modem Command interface... 02/06/2025 19:39:43 - Connecting VARA Main Modem data stream... 02/06/2025 19:39:43 - Connecting VARA Main Modem KISS Command interface... 02/06/2025 19:39:43 - Connected to VARA modem 02/06/2025 19:39:43 - Setting Bandwith to 500Hz 02/06/2025 19:39:43 - Change frequency: to last frequency used before shutdown. 02/06/2025 19:39:43 - VarAC base directory: C:\VarAC\ 02/06/2025 19:39:43 - VARA version: VARA HF v4.8.9

I am also experiencing this problem. According to the attached log file VarAC gets as far as checking for the latest version of VarAC and locks up.