7.4.2
The components are only missing in the client not in the designer. all the windows can be seen fine along with the components in the object browser.
Here is how I can reproduce the problem.
create a project
create a main window that starts on start up
create a button on the window
on the button event action performed put the following code
system.nav.centerWindow("test")
print "test"copy the button 3 times any where on the window
close and save the window in the designer
save and publish the project
press F10 to launch the client
login to the client
you will see all the buttons
leave the client open and go back to the designer
open find/replace
find “system.nav.centerWindow”
replace all with with “#system.nav.centerWindow”
save and publish the project
go back to the client
update the client if it does not auto update
now all the button are missing
let me know if it happens for you.