When I make a change in my DotNetNuke Module the clients can't see the change immediately. For example: I'm using a KendoGrid and if I make a change the column's order, it doesn't reflect in clients immediately.
If you are using resources (.js or .css) for your code, you need to modify the names of these files. You can for example add a number at the end of each file. This will force browser to reload your sources every time you make a change.