QB Issue Resolution:

Please check this article if this will help you fix the problem:

http://support.quickbooks.intuit.com/support/Articles/HOW13289

Resolution for Issue 'QB 2014 font suddenly very small' available: Yes (Solved).
Source: Intuit Community forum.

QB 2014 font suddenly very small: 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 Appearence
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Error Recovery for Appearence [Canada]
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Additional Support Options: