I've installed the plugin and the sample table appears perfectly on the page. I tried to create a new table, but it's giving errors. Do you have to add the information somewhere else besides the configuration page? I added wpf_jqgrid_sample, wpf_jqgrid_opentrades to the allowed tables field.
Then in the table formatting section, I replaced the sample code with the following and clicked execute table before saving
ID::int(12) NOT NULL AUTO_INCREMENT|
Called by::varchar(100) DEFAULT NULL|
Entry Price::decimal(10,2) DEFAULT NULL|
Target Price::decimal(10,2) DEFAULT NULL|
Am I missing something?