Standard User are not able to View/List Contacts, Organizations, Opportunity, etc
This was a problem I have been struggling for couple of days, which were SOLVED completely by making sure ALL VTIGER database and tables have same collation. Since probably other VTIGER users possibly can face similar problem, I am summarizing the solution.
1) When Installing VTIGER from scratch, make sure to CREATE DATABASE/USER, instead of letting VTIGER INSTALLATON do it, prior to run VTIGER installation script and make sure to set its COLLATION to recommended "utf8_general_ci" (I used this method)
2) Case VTIGER was migrated, or after import and configurations, recoimmended solutions might be (I did not test, but very likely that it will work) altering collations and converting database and actual tables to target collation e.g. "utf8_general_ci". Please make sure to get FULL BACKUP of VTIUGER database before start making any changes to it.