parse error syntax error

One of my users can't access my site.  She says she gets a "parse syntax error".  It seems like its only her having problems logging in.  How can I get this corrected?

CH

Educate her to clear her browser cache and possibly try different browsers  .....  No browser is consistent across the entire installation  .....  it's the only thing I can think of  ..... 
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I am having this problem with all my users...

It seems that I keep getting Parse error: syntax error message. Script is being added to my index.php file. Has anyone else had this problem. I can fix it by reloading the previous version of index page but it keeps hapening...

Imobile