APEX

Using Oracle APEX 4.1 (new install) with Oracle Http Server 11.1.1.2. APEX sql installed succesfully in database. https configured with Oracle Wallet. Some users can see the initial login page at https://servername.domain:port/pls/apex; but most users only get a blank page. Problem occurs with firefox, IE8 and Chrome browsers.

Error console in firefox give 4 errors: (server name obsfuscated

1) Error: missing : after property id
Source File: https://###########:4443/i/javascript/apex_4_1.min.js
Line: 28, Column: 257
Source Code:
keyCode:{ALT:18,BACKSPACE:8,CAPS_LOCK:20,COMMA:188,COMMAND:91,COMMAND_LEFT:91,COMMAND_RIGHT:93,CONTROL:17,DELETE:46,DOWN:40,END:35,E
NTER:13,ESCAPE:27,HOME:36,INSERT:45,LEFT:37,MENU:93,NUMPAD_ADD:107,NUMPAD_DECIMAL:110,NUMPAD_DIVIDE:111,NUMPAD_ENTER:108,NUMP

2)Error: apex is not defined
Source File: https://##########:4443/pls/apex/f?p=4550:1:8470690132508778
Line: 17

3) Error: $v is not defined
Source File: https:/###########:4443/i/javascript/apex_builder_4_1.min.js
Line: 1

4) Error: apex.jQuery is not a function
Source File: https://############:4443/pls/apex/f?p=4550:1:8470690132508778
Line: 86

Testing shows that the browser can hit and display any image from the /i/ images directory and can display the text of all javascript files in the /i/javascript directory. Flushing web cache or browser cache has no effect. Neither does stopping and restarting the http server. The default OHS page does display fine at https://############:4443

Any ideas? We are following same checklist that has worked in prvious APEX 4.1 deployments.
Thanks in advance.