No previous/next month dates in flat theme

In the calendar module there are no arrows to go to previous  and/or next months like the other themes like ext. help



PHP Version : 5.6.12

MySQL Version : 5.6.26

Server Information : Windows NT NASH-LT 6.2 build 9200 (Windows 8 Enterprise Edition) i586

Fix jQuery? : Yes

Load JEvents Bootstrap CSS? : Yes

Max Input Vars ? : 1000

Club code set? : No  

User Agent : Mozilla/5.0 (Windows NT 10.0; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0  

Joomla : 3.6.0

component_com_jevents : 3.4.16

component_com_jce : 2.5.19

component_com_acymailing : 5.5.0

module_mod_acymailing : 3.7.0

module_mod_jevents_cal : 3.4.16

module_mod_jevents_custom : 3.4.16

module_mod_jevents_filter : 3.4.16

module_mod_jevents_latest : 3.4.16

module_mod_jevents_legend : 3.4.16

module_mod_jevents_switchview : 3.4.16

plugin_acymailing_contentplugin : 3.7.0 (not enabled)

plugin_acymailing_managetext : 1.0.0

plugin_acymailing_online : 3.7.0

plugin_acymailing_share : 1.0.0

plugin_acymailing_stats : 3.7.0

plugin_acymailing_tablecontents : 1.0.0

plugin_acymailing_tagcontent : 3.7.0

plugin_acymailing_tagsubscriber : 5.5.0

plugin_acymailing_tagsubscription : 5.5.0

plugin_acymailing_tagtime : 5.5.0

plugin_acymailing_taguser : 5.5.0

plugin_acymailing_template : 5.5.0

plugin_content_jevents : 3.4.16

plugin_editors_acyeditor : 5.5.0

plugin_finder_jevents : 3.4.16 (not enabled)

plugin_search_eventsearch : 3.4.16

plugin_system_gwejson : 3.4.16