Some host providers has limitation on maximum sent parameters or post size etc. Therefor some of our clients have some issue while saving search widget options because search widget sends many parameters to the server for saving. As a solution we hided MLS/Importer addons fields in search widget by default.

If you want to include these fields in your  search widget, you should enable desired fields in search widget first. For this you can go to WPL->Flex->MLS Addon or WPL->Flex->Importer addon and click on edit icon of desired fields and set Search widget option to "Show" instead of "Hide". Please check below figure.