If they are different browsers...use the same one used on the computer that worked
Another thing to check...some people were using an OLD login site that no longer works well..use this site to log in.<a rel="nofollow" target="_blank" href="https://turbotax.intuit.com/personal-taxes/itsdeductible/">https://turbotax.intuit.com/personal-taxes/itsdeductible/</a>
We saw similar with another question and it was due to our internet connection. Hope this is helpful.