DHTLMX 2.5 - dhtmlxGrid does not work with firefox 21

We use DHTMLX 2.5. We use dhtmlxgrid for displaying table data. Until firefox 20, it works fine.
When using firefox 21, dhtmlxgrids are not displayed in the GUI. Same issue was noticed in Chrome too. What could be the issue?

Please, try to update the version of your dhtmlxGrid.