There's some sort of focus problem when multiple ace:maskedEntry fields are used in a page. Go to the showcase demo for it,

http://icefaces-showcase.icesoft.org/showcase.jsf?grp=aceMenu&exp=maskedEntryBean

Click on the first masked field, Date of birth. Move the focus to a different application window (e.g., Alt-Tab elsewhere). Now click in a DIFFERENT masked field, e.g., Mobile Phone. The 2 fields will fight for the focus; the masks flicker on and off indefinitely. Console monitor shows a continuous stream like:

[window] [Thu, 28 May 2015 22:31:42 GMT] persisted focus for element "form:workPhoneInput_field"
bridge-support.js.jsf?ln=ice.core&v=4_0_0_150512:1807
[window] [Thu, 28 May 2015 22:31:42 GMT] persisted focus for element "form:dobInput_field"
bridge-support.js.jsf?ln=ice.core&v=4_0_0_150512:1807
[window] [Thu, 28 May 2015 22:31:42 GMT] persisted focus for element "form:workPhoneInput_field"

(At this point, if you click on the other masked fields, you can get all 4 fields flickering!)

The problem does NOT occur if you simply Alt-Tab back to the browser, or if you click on the same field that had the focus when you Alt-Tab'd away. System is Windows 7 Pro. Failed on Chrome 42.0.2311.135 m and Firefox 36.0.1. - See more at: http://www.icesoft.org/JForum/posts/list/22916.page#80165