QB Issue Resolution:
With Yosemite Preview 4 (available today), QB2014 is working again. I am having some freezing when entering new customer data, otherwise it appears to be working fine
Resolution for Issue 'Quickbooks for Mac 2014 not working for Yosemite Beta' available: Yes (Solved).
Source: Intuit Community forum.
Quickbooks for Mac 2014 not working for Yosemite Beta: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.Support for Quickbooks
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