Border lines not displaying for some

http://www.magickitchen.com/menu/97121B-nutrition.html  that page looks fine to me, each cell has a white border. But the boss and everyone in his office sees it as the attached.  I am using: Firefox 40.0.2.  They are using:


Person 1:  Firefox 40.0.2

Person 2: 38.0.1

Person 3: 39

When I look at it in firebug, the CSS says the white border is there. Any ideas as to what is going on? Thanks.

We all see the same thing with the missing vertical and horizontal lines.
whattheysee.jpg
Melody ScottAsked:
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Paul MacDonaldDirector, Information SystemsCommented:
If they're using IE, see if they're in Compatibility Mode.
Brant SnowCommented:
Yes i have tested it on firefox, chrome and IE most recent versions and it works fine, it is likely a browser version issue, can you confirm they are on firefox?
Melody ScottAuthor Commented:
They're all on firefox, in the versions noted above.
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TimorosCommented:
Try reloading the page with ctrl+f5 or try deleting you browser's cash.
Tom BeckCommented:
I'm not seeing the problem on Firefox 38.0.1 in an XP virtual machine on my Mac but then again I have a retina display. I suspect the problem is a combination of very thin borders, subtle contrasts, outdated browser rendering engine, and perhaps low quality video processors and/or low resolution monitors. The borders are set the same on all table cells so the fact that only random borders are disappearing tells me that it has nothing to do with css. You have the borders set at 1px width and you specify border-collapse:collapse. If you remove border-collapse:collapse then the cells will actually have a 2px wide white border between them and they will likely be thick enough to display on low resolution monitors. The browser tries to render everything you specify but if the monitor is low resolution, there are just not enough pixels available on the screen to draw everything. That's my theory anyway.

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Melody ScottAuthor Commented:
Thanks very much for your input, everyone!
Melody ScottAuthor Commented:
That did it, everyone's happy! Thanks.
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