I loaded the newest version of Express today.
My app is in the app store as an app under development so it's not publicly available.
If I download an update into my Forerunner 245 Music using Express, the app and it's settings initially appear in Express after the download, and I can set values in the settings.
When I disconnect the watch from my computer and attempt to run the app... it does not appear in the app list.
While chasing this down I decided to connect the 245 to the Connect App on my iphone after finding that the app does not show up in the app list on the watch.
Connect shows the app and it's settings.
After changing one setting and disconnecting from Connect.... the app appears in the app list and I can run it.
Next step.... I connect the watch to my laptop and to Express.
The app appears in Express's list of apps on the watch.
I disconnect from Express. The app is still available and runs.
Reconnect to Express, changed one setting value and saved.
Ran the app... this is new.... it crashes.
Connected to the Connect app. Settings look correct.
I change the same setting value & save.
The app runs normally.
Express appears to have serious problems.
This is not new.
The problem with Express somehow corrupting the app list when loading an app, or loading an update has been occurring for as long as I've had the 245 music.