You can try the following test:
Write a script that loads a project that usually causes that problem you encounter and that also runs the action 41824.
The script should look something like this:
Code:
my_project="Projectname_with_path"
reaper.Main_openProject(my_project)
reaper.Main_OnCommand(41824, 0)
you can also try the same with multiple projects:
Code:
my_project1="Projectname1_with_path"
my_project2="Projectname2_with_path"
my_project3="Projectname3_with_path"
my_project4="Projectname4_with_path"
my_project5="Projectname5_with_path"
reaper.Main_openProject(my_project1)
reaper.Main_OnCommand(41824, 0)
reaper.Main_openProject(my_project2)
reaper.Main_OnCommand(41824, 0)
reaper.Main_openProject(my_project3)
reaper.Main_OnCommand(41824, 0)
reaper.Main_openProject(my_project4)
reaper.Main_OnCommand(41824, 0)
reaper.Main_openProject(my_project5)
reaper.Main_OnCommand(41824, 0)
If that renders without any problems, then my render-functions are a solution for you.