Ionic serve "jammed"

Hi,

I would like to know what could cause “ionic serve” to freeze, ie not opening the browser to serve my app?

Running ‘serve:before’ gulp task before serve
[18:43:59] Starting ‘clean’…
[18:43:59] Finished ‘clean’ after 40 ms
[18:43:59] Starting ‘watch’…
[18:43:59] Starting ‘sass’…
[18:43:59] Starting ‘html’…
[18:43:59] Starting ‘fonts’…
[18:43:59] Starting ‘scripts’…
[18:43:59] Finished ‘scripts’ after 362 ms
[18:44:00] Finished ‘html’ after 655 ms
[18:44:00] Finished ‘fonts’ after 928 ms
[18:44:02] Finished ‘sass’ after 3.47 s