QuoteWerks Support Portal

Using a clone of the  Standard Platform User , I have these settings under object permissions

And the following set in my Sharing Settings:

And the user can retrieve contacts owned by a different user without issue.  I am not using Permission sets, just Profiles to control access.  

Do you have specific permission sets set-up or per user-sharing detail set?

I do NOT have 'Customize Application' privilege given to the user example from above, that is why I was asking if you used Permission sets or some other sharing control.  In your Salesforce Profile, what is listed in the User License area, right under name?

You can capture traffic using a software such as Fiddler to get the request and response calls.

https://www.telerik.com/download/fiddler

Can you (temporarily) try setting the sharing settings as below?

So in reviewing your fiddler file (which I have removed from the Forum because they can contain sensitive data), there are noted differences between what is returned from the two users.  Not sure why Salesforce says they are returning the same.  I'm going top break it down into requests and responses.  For this example, I am searching for an account named Acacia

First, QuoteWerks sends a request to Salesforce logging in with the authentication information and Salesforce replies with all the information about that user such as organization name, user type, base currency, etc.  There's aren't many differences between these two other than ProfileID and RoleID (and user name, user id, full name, and sessionsecondsvalid).  

Next, QuoteWerks sends a request to Salesforce - describeSObjects - that is basically asking Salesforce to tell it about the object it is asking about, in this case Accounts.  The Salesforce API respects object-level and field-level security configured in the user interface, meaning you can access objects and fields only if the logged-in user's permissions and access settings allow such access., therefore fields that are not visible to a given user are not returned.  The describeSObjects from the user that works is significantly different than the user that doesn't (too much to screenshot even, I can send the file comparison if you need it).

Now, that shouldn't cause a problem unless one of the fields it can't see is a field QuoteWerks needs it to see, such as AccountNumber, Site, Ownership,  and  other standard Salesforce fields necessary for the integration (QuoteWerks doesn't care if we can't see your custom fields when pulling in contacts at the most basic level).

For the third request, QuoteWerks then sends to Salesforce a query based on the fields that it just returned.   So The query from the two different users is significantly different (comparison tool screenshot below):

And the response is very different as well:

With the specific Query being generated as well as the difference in response, Salesforce ***should*** be able to better tell you what the permission difference is that is causing the problem.  They should be able to run the queryString and advise why it's result size is 0 for the user that doesn't work vs 1 (correct) for the user that does work.

I'm not a Salesforce developer so I can't advise specifically what permission is causing these differences, but hopefully this will help them narrow it down.