The tab index does not start with '1'
If you loaded a Master template page in the background which has also tab indicies (for example 3 input items) the tab index will start with the first number (in this case '4'). By clicking through, it will start at '1' so you are able to overwrite it.
I uploaded a new version of a *.phis page but the changes are not visible after reloading in the browser
The Phis server caches all pages for faster access. You need to clean the cache by sending an invalidate command:
See also: phis -c.