Issues after upgrading to 3.4.3

Our church website is at least about 3 years old. I thought I would start upgrading it. I started with SermonSpeaker component and the related modules (latest, archive,sermoncast).

I see the following 3 errors on the website now. Can someone help me resolve this please ?. It looks ugly on a church website

when I click latest sermons:
Warning: implode() [function.implode]: Invalid arguments passed in
/home/xxxx/public_html/modules/mod_latestsermons/mod_latestsermons.php
on line 52

When I click archived sermons:
Warning: implode() [function.implode]: Invalid arguments passed in
/home/xxxx/public_html/modules/mod_latestsermons/mod_latestsermons.php
on line 52

Just above the sermons list on the sermons page:
Warning: strpos() [function.strpos]: Empty delimiter in
/home/fcfmason/public_html/components/com_sermonspeaker/controller.php on
line 14

According to your RSS feed i'm seeing that it is running 3.4.2. perhaps something happened during upgrade, can you try upgrading again?
<generator>SermonSpeaker 3.4.2</generator>
view-source:http://www.fcfmason.org/index.php?option=com_sermonspeaker&Itemid=94&view=feed&format=raw

Andrei is right, it looks like it's 3.4.2 installed. Not 3.4.3.

For the error messages:
Check if you have a sitename configured in your global Joomla settings. One error message could be related to that if there is no Sitename.

For the latest sermons module: The error message indicates that you have enabled the mouseover tooltips in the module settings, but no content for it. Select at least one or disable the tooltips if you don't want them. This may help.

Thanks to you both!.

I followed the suggestions that Thomas posted. All issues are resolved.
This is top notch support!!

I'm glad it worked