To be compatible: place PersonalCRM toggle to the RIGHT of the Search bar, instead to the right of the Gear setting currently.
Under Gmail settings, there is a popular Gmail Lab called "Multiple Inboxes". PersonalCRM Panel doesn't work well with Multiple Inboxes. With the current placement of PersonalCRM toggle (on the right of the Gear setting), the toggle doesn't show up when Multiple Inboxes is enabled.
Suggestion of where to place the PersonalCRM toggle: instead of on the right of the Gear setting, move it up to the RIGHT side of the Search bar, similarly to how Streak, MixMax extensions place their toggle/settings.