I am running OpManager v12.

I have been trying to add custom monitors to my device but I have some issues. 

I went to device template -> Add Template. 

I added the Device template name, a new vendor name, category is unknown. Device Identifier (sysOID). 

I then added a new Monitor. 

Some issues seem to be present: 

1) When I add a new monitor, often times it just goes away. When I click again on my custom device template. I can't find it in the Monitor section or in the list of vendor monitors. The monitors adds sometimes after trying several times. 

2) How can I delete custom vendor monitor ?

3) The only way to show the monitors in the device page is to delete the device and then import it again. If I add a monitor in the template and rediscover the device, the monitor does not show. Is there another way to do that ? 

Please advise about these problems especially about the first issue. 

Thank you.