Problem: Markers don't display in the Style Manager after several folders have been opened
When opening the Marker Symbols folder in the Style Manager, the name of the symbol is present but there is no symbol.
All symbol types are loaded into memory to speed the display of symbols within the manager. The symbols will stop to display when the allocated memory has been exceeded. This is more evident for marker symbols, as they tend to occupy a larger amount of the available memory.
Solution or Workaround
Close the Style Manager and reopen it to display more symbols. This will reset the memory allocation.
Turn off unneeded styles to reduce the amount of available symbols.